JPH06137524A - Bunsen burner - Google Patents

Abstract

PURPOSE:To eliminate fluctuations of a flame due to wind by providing a primary air suction hole and a secondary air suction hole, and sucking combustion air at two stages. CONSTITUTION:A plurality of secondary air suction holes 3 are provided at a periphery of an end plate 2 of a flame stabilizing cylinder 1, a plurality of primary air suction holes 7 are opened at a periphery of a rear part from the plate 2 of a nozzle tip 5 to suck combustion air at two stages. The holes 7 are formed in a small-diameter nozzle hole 6, and the air is mainly sucked by Bernoulli effect, and hence its suction force is larger than that of the hole 3, the air is sufficiently mixed in a space formed at a front part in the hole 6 and injected from a nozzle hole outlet 6a. Accordingly, reverse speed of the flame is accelerated to scarcely cause lifting, and a flow rate regulating range can be increased. Thus, mixture ratio of fuel gas and the air can be improved to eliminate fluctuations of the flame.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Bunsen type gas burner.

[0002]

2. Description of the Related Art Generally, a forced-air type gas burner requires a blower or an air pipe as a combustion air source, a safety device such as a wind pressure switch, a gas / air mixer, an adjusting valve, etc. The type burner sucks the combustion air by using the jet pressure of the fuel gas jetted from the gas nozzle, and therefore has the advantage that it does not require the above-mentioned device, etc., and does not take up much space for installation. It is often used as a burner group for non-ferrous metal casting molds and synthetic resin molding dies that require uniform external heating.

[0003]

However, the conventional Bunsen type gas burner has a low air pressure except for the case where an auxiliary tool such as a venturi regulator for improving the mixing is used, and therefore the fuel gas and the combustion air are not mixed with each other. Since the mixing is not performed sufficiently, the good combustion range is narrow and it is difficult to adjust the flow rate of the burner.Because many are installed in a small space with a small capacity, it is difficult to adopt a venturi regulator. In addition, since it is often used in the open part, there is a problem that the flame easily fluctuates in the wind. In view of these problems, it is an object of the present invention to provide a Bunsen gas burner in which the mixing of fuel gas and combustion air is good, a large turndown ratio can be achieved, and the flame is hard to fluctuate in the wind. Is.

[0004]

As shown in FIGS. 1 and 2, a Bunsen type gas burner according to the present invention is provided with a plurality of secondary air suction holes 3 in the peripheral portion of an end face plate 2 of a flame holding cylinder 1. A pipe-shaped single flame hole type nozzle tip 5 is fitted into a tip holding hole 4 provided at the center of the end face plate 2 to hold an intermediate portion thereof, and a portion of the nozzle tip 5 rearward of the end face plate 2 is A plurality of primary air suction holes 7 are provided through the peripheral wall to suck the combustion air in two stages.

[0005]

In the conventional structure shown in FIG. 4, since the outlet 6a of the nozzle hole 6 and the secondary air suction hole 3 are far from each other, the secondary air is sucked into the fuel gas mainly due to the viscosity. According to the configuration, the primary air suction hole 7 has the thin nozzle hole 6
Since the air is mainly sucked by the Bernoulli effect, the suction force is larger than that of the secondary air suction hole 3, and this air is a space formed in the front portion of the nozzle hole 6. Since the mixture is sufficiently mixed and injected from the nozzle hole outlet 6a, the retrograde speed of the flame is increased, lifting is less likely to occur, and the flow rate adjustment range can be made wider than in the conventional case. A partition plate 9 having a pore 8 at the center is provided slightly rearward of the primary air suction hole 7 in the nozzle hole 6 because the flow velocity of the fuel gas is adjusted by the size of the pore 8. This is so that the amount of sucked air can be adjusted. Further, the reason why the primary air suction hole 7 and the nozzle hole 6 are merged at an acute angle is to prevent the fuel gas from leaking from the primary air suction hole 7 to the outside when the gas supply amount is reduced. The reason why the protective cylinder 10 is provided so as to project also to the rear of the face plate 2 is to prevent the secondary air suction hole 6 from being blown by the wind and changing the suctioned air amount.

[0006]

1 is a vertical sectional view showing an embodiment of a Bunsen burner according to the present invention, and FIGS. 2 (a) and 2 (b) are a front view and a vertical sectional view of a nozzle tip used in the present invention. Figure 1
In the above, a plurality of secondary air suction holes 3 are annularly provided in the peripheral portion of the end face plate 2 of the flame holding cylinder 1 for protecting the flame, and a chip holding hole 4 is provided in the center thereof. A pipe-shaped single flame hole type nozzle tip 5 is penetrated through the tip holding hole 4, and a large-diameter hexagonal portion 5 formed in an intermediate portion thereof.
It is screwed and held by a and the screw portion 5b. As shown in FIG. 2, six primary air suction holes 7 that join the nozzle hole 6 at an acute angle are formed on the peripheral wall of the hexagonal portion 5a formed in a portion rearward of the end face plate 2 of the nozzle tip 5. A partition plate 9 which is obliquely provided and is provided slightly behind the primary air suction hole 7 in the nozzle hole 6 is provided with a pore 8 in the center thereof. Further, the nozzle hole 6 has a sufficient length on the front side of the partition plate 9 to secure a space for mixing the primary air and the fuel gas therein, and the flame holding cylinder 1 behind the end face plate 2. The protective cylinder 10 extended to form a role of preventing the outside air pressure applied to the primary air suction holes 7 from becoming non-uniform due to wind.

FIG. 3 shows an example of use of a Bunsen burner, in which a gutter 12 which is a runner of a metal having a relatively low melting point and which is discharged from a melting furnace 11 is heated by a plurality of Bunsen burners A. is there. In such usage, the Bunsen type that spreads the flame is more suitable than the ordinary blast type burner that heats the local area intensively. However, in the conventional Bunsen type burner, as shown in FIG. The nozzle hole outlet 6
Since the fuel gas ejected from a is not mixed with primary air, if the flow rate is increased, lifting is likely to occur and the adjustment range of the heat power is narrow (9 KCAL / m2 / hr), and the momentum of the flame is small (flame length 300 mm). Therefore, according to the present invention, the mixed gas is ejected from the nozzle hole outlet 6a and is further mixed with the secondary air sucked from the secondary air suction hole 3. Since it burns, even if the gas supply amount is increased (22 to 23 KCAL / m2
/ Hr) There is no risk of lifting, and the flame can be made strong (flame length 700 mm).

[0008]

As described above, according to the present invention, since there is no need for an air blower, an air pipe, a wind pressure switch, an air valve, etc., there is a Bunsen type advantage that the installation space is low and the fuel consumption is low. The mixture of gas and combustion air is good, the flow rate adjustment range can be made large, and the flame does not easily fluctuate in the wind. Therefore, the runner of a melting furnace for nonferrous metal or the molding die or the molding die of synthetic resin can be used. There is the advantage that a gas burner suitable for heating can be provided.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of a Bunsen burner according to the present invention.

FIG. 2 (a) is a front view of a nozzle tip used in the above,
(B) is the longitudinal cross-sectional view.

FIG. 3 is a perspective view showing a usage example of the present invention.

FIG. 4 is a vertical sectional view of a conventional example.

[Explanation of symbols]

 1 Flame Retaining Tube 2 End Face Plate 3 Primary Air Suction Hole 4 Chip Holding Hole 5 Nozzle Tip 5a Hexagonal Part 5b Screw Part 6 Nozzle Hole 6a Nozzle Hole Outlet 7 Secondary Air Suction Hole 8 Pore 9 Separator 10 Protective Tube

Claims (4)

[Claims] 1. A plurality of secondary air suction holes are provided in the peripheral portion of an end face plate of a flame holding cylinder, and a pipe-shaped single flame hole type nozzle tip is fitted into a chip holding hole provided in a central portion of the end face plate. A Bunsen burner in which a plurality of primary air suction holes are transparently provided in a peripheral wall of a portion of the nozzle tip rearward of the end face plate by inserting the primary air suction hole. 2. The Bunsen burner according to claim 1, wherein a partition plate having a small hole in the center thereof is provided slightly rearward of the primary air suction hole in the nozzle hole. 3. The primary air suction hole is formed obliquely,
The Bunsen type burner according to claim 1, wherein the nozzle holes are merged at an acute angle. 4. A Bunsen burner according to claim 1, wherein a protective cylinder is provided so as to project rearward from the peripheral edge of said end face plate.